linux-kernel - [PATCH 3/6] clk: ingenic: Read bypass register only when there is one

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Date:   Sun,  7 Mar 2021 14:17:56 +0000
From:   Paul Cercueil <paul@...pouillou.net>
To:     Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Zhou Yanjie <zhouyanjie@...yeetech.com>
Cc:     od@...c.me, linux-clk@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mips@...r.kernel.org,
        Paul Cercueil <paul@...pouillou.net>
Subject: [PATCH 3/6] clk: ingenic: Read bypass register only when there is one

Rework the clock code so that the bypass register is only read when
there is actually a bypass functionality.

Signed-off-by: Paul Cercueil <paul@...pouillou.net>
---
 drivers/clk/ingenic/cgu.c | 19 +++++++++++--------
 1 file changed, 11 insertions(+), 8 deletions(-)

diff --git a/drivers/clk/ingenic/cgu.c b/drivers/clk/ingenic/cgu.c
index 0619d45a950c..7686072aff8f 100644
--- a/drivers/clk/ingenic/cgu.c
+++ b/drivers/clk/ingenic/cgu.c
@@ -99,13 +99,14 @@ ingenic_pll_recalc_rate(struct clk_hw *hw, unsigned long parent_rate)
 	od_enc = ctl >> pll_info->od_shift;
 	od_enc &= GENMASK(pll_info->od_bits - 1, 0);
 
-	ctl = readl(cgu->base + pll_info->bypass_reg);
+	if (!pll_info->no_bypass_bit) {
+		ctl = readl(cgu->base + pll_info->bypass_reg);
 
-	bypass = !pll_info->no_bypass_bit &&
-		 !!(ctl & BIT(pll_info->bypass_bit));
+		bypass = !!(ctl & BIT(pll_info->bypass_bit));
 
-	if (bypass)
-		return parent_rate;
+		if (bypass)
+			return parent_rate;
+	}
 
 	for (od = 0; od < pll_info->od_max; od++) {
 		if (pll_info->od_encoding[od] == od_enc)
@@ -225,11 +226,13 @@ static int ingenic_pll_enable(struct clk_hw *hw)
 	u32 ctl;
 
 	spin_lock_irqsave(&cgu->lock, flags);
-	ctl = readl(cgu->base + pll_info->bypass_reg);
+	if (!pll_info->no_bypass_bit) {
+		ctl = readl(cgu->base + pll_info->bypass_reg);
 
-	ctl &= ~BIT(pll_info->bypass_bit);
+		ctl &= ~BIT(pll_info->bypass_bit);
 
-	writel(ctl, cgu->base + pll_info->bypass_reg);
+		writel(ctl, cgu->base + pll_info->bypass_reg);
+	}
 
 	ctl = readl(cgu->base + pll_info->reg);
 
-- 
2.30.1